Hydraulic jack.



H. WLFREESE.

HYDRAULIC JACK.

APPLICATION FILED NOV. 5, m4.

Patented J an. 16, 1917.

2 SHEETS-SHEET I.

blag li- HEW. FREESE.

HYDRAULIC JACK.

2 SHEETS-SHEET 2.

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Patented Jan. 16, 1917.

UNITED STATES PATENT OFFICE.

HERMAN w. rnnnsn, or cnrcAeo, irnmorsAssrenon, BY MESNE ASSIGNMENTS, To

cAnL A. WALDRON, TRUSTEE, or CHICAGO, ILLINOIS.

' HYDRAULIC JACK.

To all whom it may concern Be it known that I, HERMAN W. Fnnnsn, a citizen of the United States, residing at Chicago, in the count of Cook and State of Illinois, have invented a new and useful Improvement in Hydraulic Jacks, of which the following is a specification.

Myinvention relates more'particularly to hydraulic jacks. for use in connection with may be placed in a tool-box in any position without danger of leakage.

Referring to' the accompanying draw-- ings: Figure.-1 isa view inside elevation of 'a hydraulic jack constructed in accordmy'invention, the parts being ance w1 h I shown the positions they assume during the actua 'on of the pump to supply fluid to the working cylinder. Fig. 2 is an enlarged broken section, taken at the irregular line 2 at Fig. 1, and viewed in the direction of the arrow. Fig. 3 is a perspective view of the head which closes the upper -end-of the pump-cylinder. Fig. 4 is a perspective view of an adjustable collar which coiiperates with the head of Fig. 3; and Fig. 5 is an enlarged broken view in elevation of the device shown in Fig. 1, thehandle' which operates the piston being shown by full lines inits uppermost position and in dotted lines inits lowermost position during the normal operation of the pump, the collar of Fig. 4 being shown in dotted lines in the position it aspump, and in full lines the .position it assumes before permitting said handle to be depressed -for operating certain valve mechanism for permitting the fluid to flow back "from the cylinder containing the piston on which the load is to be supported to the reservoir.

' In the particular construction illustrated, the device is formed with the base 6 containing a chamber, or reservoir, 7 for the fluid, which may be oil or any other suitable fluid,

Specification of Letters Patent. Patented Jan, 16, 1917, Application filed November 5, 1914. Serial No. 870,319. I

through the medium of which the piston for I supporting the load to be lifted and hereinafter described,is operated. Screwed into a socket in the upper wall 8 of the base 6 is-an upright cylinder 9 containing a piston 10 formed of a sleeve 11 terminating at its upper end in a head 12, preferably concave at its upper end, as represented at 13, to adapt it to fit against the underside of the axle of the vehicle to be raised, the lower end of the piston being provided with a cup-leather 14, as is usual in the case of pistons. Screwed into an opening 15 in the top of the base 6 is a cylinder 16 and arranged concentric with the cylinder 16 and screwed at its lower end upon a boss 17 formed on the top of a member 8, closely fitting the opening 15 in the top 8 of the base and depending below the underside of the latter, as represented, is a cylinder 18,

the latter forming the cylinder of a pump. The upper ends ofthe cylinders 16 and 18 are closed by a cap 19 secured to the cylinder 16, as bya screw 20, the cylinder extend ingatits-upper end into a recess 21 in the underside of the cap 19, and the cylinder 16- fitting at its top against the underside of a flange 22 provided by the periphery of the head 19. The cylinder 18 contains a piston 23 which is guided in an opening 24 in the head 19. The upper end of the piston 23 is connected with an operating handle 25 fulcrumed at one end on a pin. 26 secured in the arms 27 of a bifurcatedextension 28 provided on the head 19, and secured thereto by. screws 28 passing through openings 28 in the extension. The means shown for connecting the piston 23 to the operating lever 25 comprise a pair of links 29 which straddle the operating handle at their upper ends and are pivotallyconnected therewith by a pin 30 passing through the arms 29 and saidlever, the lower ends of these links embracing the upper end of the piston 23 and pivotally connected therewith, as by a pin 31 pass ng through these links and the upper end of the piston, it being understood from the foregoing description that. by rocking the lever 25 on its fulcrum 26 the piston'2'3 will be reciprocated in the cylinder 18. The interior of thecylinder 16 communicates with the reservoir 7 through themedi'um of a passage 32 in the member 8, for a purpose hereinafter described. Opening into thebottom of'the cylinder 18 are passages 33 and,34.-, which serve as dersi e inlet and outlet passages, respectively, for

:the pump cylinder. The passage 33 con-' tains in ts upper end a nipple containing an opening forming a continuation. of the and opening into the lower end passa e 41 in a'block 42 secured to the unthe upper end of the'passage 41 communieating with a passage 43 in the top 8 opening into the bottom of the cylinder 9. The passage 34 is of reduced diameter compared with the passage 39 to afiord a seat for a ball-valve 44 which is backed up by a spring 45 interposed between said ball and the r with the a plp'e pen at its opposite ends, being conv (and 0f t e opening 47 screw-block 46 screwed into the member 8 in line with the passage 34., The valves of which the bal1s 37 and 44 are parts, serve as inlet and outlet valves, respectively, for

a pump, the ball 37 in the upward movement of the piston 23 unseating against the action of the spring 38 to permit fluid to be drawn from the reservoir into the lower end of the cylinder 18, the ball 44 in thisoperationremaining seated and the ball 44 in the downward movement of the piston 33 unseating against the action of the spring 46 to permit the fluid, previously introduced into the As soon as the piston 23 of the pump finishes its downward movement, the

1144 again seats and closes thepas'sage 44,. thus preventing the fluid pumped into the cylinder 9 from escaping therefrom.

The means for of the fluid from the cylinder 9 when it is desired that the piston" 10 be permitted to lower in the cylinder 9 comprise, in the preierre'd illustrated embodiment of my invention, the following mechanism- The 'mem-' her '8" contains an opening 47 which compassages 40 and 39, the

fined at its lower end in the upper end of the pamge 47 and extending upwardly into the ace between the cylinders 16 and 18. The ower end of the pipe 48 forms a seat for a ball 49 adapted to close the lower end of the opening through the pipe 48, when a'gainstthe latterby the action of a spring-50 confinedbetween the ball 49 and t e book 51-screwed into and, closing the A, vertically movable rod 52 extends at its lower end into the enlargement 54 communicates with a pasat its upper end a seat for of the top 8 in any suitable manner, I

1 the piston 10 cylinder 18, to be forced throughv passagw 34, 39, .40, 41 and 43 into the lower.- end of the cylinder"9 for lifting the piston 10, the ball 37 remaining seated in this op-. eration,

between thecylinder 9 and the pipe 48.

controlling the discharge metrically opposed recesses .53 in the head 19 and extending upwardly into an enlargement 54 of this passage. The

sage 55 of reduced diameter, aiiording a seat at-its lower end for a ball 56 normally held in seated position by-the action of a spring 57 confined between the bottom of the enlargement 54 and the ball 56. llhe upper end of the rod 52 extends into close proximity to the ball 56, as shown in Fig. 5,-but this rod is of suchilengththat' while both'balls 49 and 56 may. be seated at the same time, the unseating of the ball 56 by pressing it downwardly will operate through the medium of the rod 52, to unseat theball 49, a rod 58in the passage 55 hearing at its lower end onthe ball 56 and extending at its upper end above the topl of the passage 55 serving as means throng the medium ot- Which the against the action of the springs 57 and 50, respectively. It will be understood from-the foregoing that, assuming that the piston; 10 has been raised by operating the j pump, the fluid su porting may be released f om the cylinder 9 bypressing down on the rod 58 which unseats the ball 49, as above stated, thus permitting the fluid to flow from the cylinder 9 through the passages'43, .41, 40, 47, pipe 48 into the space between the cylinders 16 and 18 and thence through the passage ,32'ba'ck into the reservoir 7, the speed of downward movement of the piston 10' be? ingregulated by the degree. to which the ball 49 is unseated. Furthermore, it will be noted that the piston 10 may be stopped at any desired position in the cylinder 9 by discontinuing downward pressure on the rod 58 as the ball-valve 49 thereupon immediatelyicloses shutting "oil communication the purpose just stated, by engagement there with of the pump handle 25. To prevent, the operation of the rod 58 as stated, during the normal operation of the pump, ll provide as1eeve'58 which surrounds the piston 23 and is rotatable thereon, this collar being provided with diametrically opposed lugs "59, adapted to enter either deep dia-' the boss 61, extending on the top of the head'1 0i relatively shallow recesses 62 in this boss. The recesses 62 are of such depth that when the sleeve 58 extends at its lugs "59 into these shallow recesses, the lower end 1:

of a screw 63, screwed into the handle 25 and adjustable therein, will reach short of the upper end of-ithe rod 58 when the handle 25 is depressed to a position in which stops 64, provided on the upper end of the 1 balls 56, 'rod 52 and ball 49 may 'be depressed 60, provided in 1:

ing means, and

piston 23, abut against the top of the sleeve 58, as represented by dottedlines in Eig...5.

the sleeve in this figure being shown in the said position, by dotted lines. The, recesses 60 are of such depth that when the lugs 59 on the sleeve 58 register therewith, the sleeve 58 will extend in such a plane below that at which it extends when in raised position, as above stated, as will permit the handle 25 to be lowered sufficiently far to cause the lower end of the screw 63 to engage the upper end of the rod 58 and depress the latter for unseating the ball 49 to permit of the discharge cylinder 9.

It will be understood from the foregoing that the arrangement of the parts of the construction is such that lieupon its side or in inverted position, the fluid through the medium of which the jack is operated, would not leak from the jack and thus the device is always ready to be used, and other manifest objections of leakage, are avoided.

hat I claim as new by Letters Patent is- 1, A hydraulic-jack comprising, in combination, a cylinder, a piston movable in said cylinder, a reservoir for fluid, a reciprocating pump in communication with said reservo r and said cylinder, means for actuating sa d pump, a passage communicating with sa d cylinder and reservoir, a check-valve in said passage for controlling the latter, adustable means extending into the'path of movement of the pump-actuating means for limiting the movement of said pump-actuat-.

means operated bysaid pump-actuat ngmeans when said adjustable means aread usted out of position for limitmg the movement of said pump-operating means, for actuating said "alve, for the purpose set forth. j

2. A hydraulic-jack comprising, in combinat on, a cylinder, a piston movable in said cyllnder, a reservoir for fluid, a pump-barrel, a piston movable therein having an operati'ng handle, communication with said reservoir and said cylinder, a passage'through which the fluid introduced into said cylinder is returned to said reservoir, a valve in said passage, ad ustable means extending into the path of movement of the pump-actuating means limiting the movement of said handle, and means operated by said handle when said adjustable means are adjusted to a position in which the movement of said handle is unobstructed thereby, for actuating said valx e to open said passage. v

3. A hydraulic-jack comprising, in combiand desire to secure v nation, a cylinder, a piston movable therein,

a receptacle for fluid, a pump for pumping said cylinder,

an elongated chamber communicating with of the fluid from the 7 even should the jack said pump-barrel being in nation, a cylinder,

said cylinder and through an vv,outlet,,..with

asaid recept'a'cle, the only outlet of said chamher being between said valves, a check valve in the lower portion of said chamber normally closing the latter to said cyli'nder, .a reciprocable rod in said portion of said chamber and located above the liquid in said chamber when the device is in upright position and adapted when operated to actuate said rod and open said first-named check-valve, and means for actuating said second-named check-valve. 4. A hydraulic jack comprising, in comblnation, acylinder, a piston movable in said chamber engaging said check-valve, a check-valve in the upper member at one elevation when rotatably a-djusted to a certain position, and to hold it in a lower elevation when adjusted to another position, said member cooperating with said pump-actuating means forlimiting the movement of the latter, and means operated by said pump-actuating means, when said member is in its lowermost position for actuating said valve, for the purpose set forth.

5. A hydraulic jack comprising, in combination, a cylinder, a piston movable in said cylinder, a reservoir for fluid, a reciprocat-- ing pump 1n communication w1th 'sald ms 7 ervoir and cylinder, means for actuating said pump, a-passage communicating with said cylinder and reservoir, a check-valve in said passage for controlling the latter, a

' rotatable member mounted on the upper end of said pump and providedwith lugs, said. pump being provided on its upper surface,

with stepped surfaces adapted to cooperate with said lugs whereby upon rotatably ad justing said member the latter may be caused to extend at different heights, said memberbeing positioned to limit the movement of said pump-actuating means, and means operated by said pump-actuating means when said member is in lowermost positionfor actuating said valve, for the purpose .set forth.

6. A hydraulic jack comprising, in combia piston movable in said cylinder, a reservoir for fluid, a reciprocatmg pump ,in' communication with said res- 'ervoir and cylinder, means for actuating said pump, a passage communicating with saidv cylinder and reservoir, a check-valve in said passage for controlling thelatter, the top of said pump being formed with sets of recesses of difl'crent depths, a sleeve surrounding the pump-actuating means and provided with lugs adapted to seat, upon the cylinder rotatably adjusting said sleeve, into either set of recesses to adjust it vertically, means connected with said pump-actuating means cooperating with said sleeve and serving to limit the movement of said pump-actuating means, and means operated by said pumpactuating means when said sleeve extends in the deepest recesses for actuating said valve. '7 A hydraulic jack comprising, in combination, a cylinder, a'piston movable in said cylinder, a reservoir for fluid, a pump communicating with said reservoir and cylinder for pumping fluid from the reservoir into 'to actuate'said piston, a second cylinder surrounding said pump, said second cylinder opening into said reservoir and communicating with said first-named cylinder, a check-valve controlling communicationbetween said first-named cylinder and said second cylinder, and means for actuating' said check-valve.

8. A hydraulic jack comprising, in combination, 'a base containing a reservoir. for fluid, a cylinder on said base, a'piston movable in said cylinder, a second cylinder mounted on .said base with passages leading j therefrom communicating respectively with the interior of said receptacle and withthe liquid to be drawn from said reservoir in the movement of the interior of said first-named cylinder, a piston operating in said second cylinder, checkvalves controlling the-passages leading from said second cylinder and operating to permit into said second cylinder .through its top,

erated to operate the,

piston therein in one direction and force it therefrom into said first-named cylinder in the opposite movement of said piston, av

third cylinder mounted on said base and surroundlng said second cylinder and spaced therefrom, a passage leading from said third cylinder into said reservoir" and a passage communicating with said first-named cylinder,'a check-valve between said third cylinder and said first-named cylinder, said third cylinder containing a passage opening said passage,'means extending between the check-valves for said third cylinder operating when said last-named check-valve is opother check-valve therein, means cooperating with the checkvalve in the top of said third cylinder, for

a check-valve controllingbut when adjusted to another position 

